八十四调理论是由以下哪位乐律家最早提出的（）。
A.何承天
B.蔡元定
C.苏氏婆
D.万长宝、郑译
参考答案：D
The middleaged woman ________ the difficulties to bring up her three children. [ ]
A. settled
B. found
C. overcame
D. sought
污水处理厂几种常用泵？
